Question regarding webservice calls

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Hi.

I´ve seen many tutorials that talks about jquery JSON calls to a webservice.
Basically many of them suggest that you make a webservice call like this:

$.ajax({
        type: "POST",
        data: "{'SomeText': " + $("#textbox").val() + "}",
        url: "/YourWebService.asmx/MethodName",
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: functionToCallWhenSucceed,
        failure: funcitonToCallWhenFailed
});

But why do I want to do that, when I can call the webservice with more simple code like this:

Namespace.WebserviceName.TheMethod(Variable1, Variable2, functionToCallWhenSucceed, funcitonToCallWhenFailed);

I know that the first option is a POST call, but what difference does it make? And isnt the data transferred from the .net 4.0 webservice not serialized in JSON anyway?

I hope you can help me understand the difference between these ways of communicating with a webservice.

Thanks alot, and kind regards,
Lars

Posted 3-Apr-11 9:22am

lvq684

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Keith Barrow · Accepted Answer · 2011-04-03T12:31:00

"But why do I want to do that, when I can call the webservice with more simple code like this?"
You are quite right: the second code is simpler, but the first call can be made from the browser (it is just Javascript). This means you can consume web services direct from an HTML page. The first method would need to be called from the web server.[Edit] You can AJAX enable the webservice, but this requires the download of a lot of JavaScript (~1700k!) to make the call most end users don't want to do this, the jquery is lighter.

And isnt the data transferred from the .net 4.0 webservice not serialized in JSON anyway?
Not always it depends on your set-up, it can be transferred via a protocol called SOAP, this is much more verbose (a specialised XML Schema) but it does have stronger typing. SOAP vs JSON is a holy-war topic, but each has its place if used correctly. You have to change the serializer to return JSON , the default serialisation is XML.